Nine
Chat with our AI personalities
12C9 = 220
There are 36 possible combinations.
one digit: 5 ways two digits: 5 * 9 ways three digits: 5 * 9 * 8 ways four digits: 5 * 9 * 8 * 7 ways ... ten digits: 5 * 9! ways So if you have to use ten digits, then the answer is 5 * 9! = 1814400. If you can use anywhere from one to ten digits, then the answer is: 5 * (9! + 8! + 7! + 6! + 5! + 4! + 3! + 2! + 1) = 2045565
There are many, many ways. Here is one:9*(1+4)*(5+7+8)+6-2*3There are many, many ways. Here is one:9*(1+4)*(5+7+8)+6-2*3There are many, many ways. Here is one:9*(1+4)*(5+7+8)+6-2*3There are many, many ways. Here is one:9*(1+4)*(5+7+8)+6-2*3
Assuming the 20 are all different, there are 20C11 = 20!/(11!*9!) = 167,960 ways.